Immunogen sequence: GVVEFYSGSL GGTISYEAQD KTQDLENFLC NNLQCGSFLK HLPETEAGRA QDLGEPREHQ PLPIQWKIQN SSCTSLEHCF RKIKPQK. CD5 is a 67 kDa human T-lymphocyte single-chain transmembrane glycoprotein. CD5 is present on all mature T-lymphocytes, on most of thymoc